speed noted in Step b. If it does not. the p lu n g er m ay be
b in d in g due to d irt, corrosion, varnish, etc. If the
problem cannot be corrected, the actu ato r m ust be
replaced.
g.
If the engine RPM noted in c is not w ithin the
specified T R C speed range, the T R C actu ato r m ust be
adjusted.
4.
To adjust the throttle lever actuator.
a.
A pply 20 in. hg. (68kPa) vacuum to the
actuator. M anually open the throttle slightly and allow to
close ag ain st the extended actu ato r plunger.
b.
To adjust the throttle lever actuator, turn the
hex-end plu n g er on the actu ato r to o b tain the specified
speed.
• 292-1600 RPM
• 305-1600 RPM
• 350-1500 RPM
• 400-1500 RPM
•
454-1500 RPM
Replacement
D isconnect vacuum hose at actuator. R em ove two
screws and actu ato r (454 only). O n all o th e r applications
unlock spider w asher and loosen large nut to rem ove
actu ato r from bracket. Reverse procedure to install new
unit and re fe r to 4 above fo r p ro p e r speed adjustm ent.
VACUUM ADVANCE CONTROL
TR A P P E D V A C U U M SPA R K
G eneral Description
T ra p p e d vacuum spark (Figs. 6E-13 and 14) is on all
454 C ID engines w ith heavy duty em issions. A th erm al
vacuum switch (TVS) is m o unted in the cylinder head
sensing engine coolant te m p eratu re and a delay valve is
betw een m an ifo ld vacuum , d istrib u to r and therm al
vacuum switch.
W h en engine te m p era tu re is below specified valve,
the m an ifo ld vacuum signal is routed thro u g h the delay
valve to the d istrib u to r. Ports on TVS are blocked. The
delay valve will keep the vacuum to the d istrib u to r at
vacuum levels h ig h er th a n m an ifo ld depression d u rin g
vehicle acceleration. A sm all sintered iron bleed is
provided in the delay valve to allow fo r a leak-dow n to
en ab le restarts in case o f engine stalls.
W hen engine tem p e ratu re is above specified valve,
the ports on TVS will be open to allow m an ifo ld vacuum
to the distributor. The delay valve in the m ode o f
o p eratio n acts as a connector.
SPA RK C O N T R O L S W ITC H
General Description
Spark control switch (Figs. 6E-9 and 6E-11) system
is used on som e 350/400 CID engines w ith heavy duty
em ission to help protect the engine du rin g an over-heat
mode.
W hen coolant is at norm al o p e ra tin g tem p eratu re,
p o rted vacuum is directed thro u g h a th erm al vacuum
switch (TVS) to the d istrib u to r vacuum advance.
W hen coolant is above n o rm al o p e ra tin g te m p e ra
ture, full vacuum is directed through the TVS to
distrib u to r vacuum advance. This advances the tim ing
and allows the engine to run cooler. At this time, full
vacuum is directed to the d istrib u to r vacuum advance at
idle.
Содержание 1977 light duty truck
Страница 1: ......
Страница 28: ......
Страница 70: ...Fig IB 24 Four Season System Vacuum Diagram C K Models 1B 24 LIGHT TRUCK SERVICE M A N U A L...
Страница 71: ...Fig lB 25 Overhead System Wiring Diagram C K Models AIR C O N D ITIO N IN G 1 B 2 5...
Страница 72: ...Fig IB 26 C60 System Wiring Diagram G Models...
Страница 74: ......
Страница 75: ...Fig lB 29 Motor Home Chassis Wiring Diagram THERMOSTATIC SWITCH AIR C O N D ITIO N IN G IB 2 9...
Страница 106: ......
Страница 128: ......
Страница 129: ...Fig 2D 5 Typical 05 and 0 6 Vans...
Страница 136: ......
Страница 148: ...Fig 2D 51 Rear Door Controls...
Страница 158: ...Fig 2D 79 Folding Top Assembly...
Страница 159: ...Fig 2D 80 Folding Top Side Moldings and Header...
Страница 161: ...Fig 2D 85 Dnver s Bucket Seat 14 Fig 2D 86 Passenger s Bucket Seat 14...
Страница 162: ...Fig 2D 89 Rear Folding Seat 06 Fig 2D 9 0 Rear Bench Seat 14...
Страница 163: ......
Страница 164: ......
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Страница 185: ......
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Страница 190: ......
Страница 225: ......
Страница 226: ......
Страница 248: ...Fig 3B 77 Removing Bearing Housing Pivot Pins Fig 3B 79 Replacing Lock Bolt Spring...
Страница 278: ...C 10 G 10 20 C 20 30 G 30 P 10 30 9 Fig 3C l Front Suspension C P Series...
Страница 284: ...BALL JOINT DIAGNOSTIC PROCEDURE...
Страница 316: ......
Страница 321: ...Fig 3D 12 Rear Spring Installation G Models...
Страница 322: ......
Страница 325: ......
Страница 326: ......
Страница 336: ......
Страница 352: ......
Страница 378: ......
Страница 395: ...Fig 5 2 Front Brake Pipes and Hoses C K Models...
Страница 396: ......
Страница 397: ...Fig 5 4 Front Brake Pipes and Hoses P Models BRAKES 5 1 3...
Страница 400: ......
Страница 401: ...V 8 N 4 0 L 6 N 4 0...
Страница 402: ......
Страница 403: ...fryIvtcwfA POOO 4 2 MODELS lVIEW C K MODELS P 3 0 0 3 2 MODELS G MODELS Fig 5 9 Parking Brake Assembly Typical...
Страница 404: ......
Страница 405: ...P300 42 M40 JB9...
Страница 438: ......
Страница 448: ...Fig 6A 4 P Series Engine Rear Mount...
Страница 451: ...Fig 6A 8 K Series Engine Rear Mount...
Страница 452: ...ENGINE M O U N T BRACKET ALL K SERIES W ITH L 6 ENGINE 6A14 LIGHT TRUCK SERVICE M A N U A L...
Страница 483: ...FUEL PUMP PUSH ROD OILING OIL F LTER AND BY PASS VALVE...
Страница 484: ...FUEL PUMP PUSH ROD OILING CRANKCASE AND CRANKSHAFT OILING VALVE MECHANISM OILING...
Страница 487: ......
Страница 488: ...MOUNT VIEW A V AUTOMATIC TRANSMISSION FRONT MANUAL TRANSMISSION...
Страница 489: ......
Страница 490: ......
Страница 568: ......
Страница 599: ...CARBON c 5 PILE L VOLTMETER f m s K K K V v D BATTERY RESISTOR TEST AMMETER s S S 5 S V GENERATOR D C...
Страница 602: ......
Страница 605: ......
Страница 612: ...Fig 6D 3i High Energy Ignition Basic W iring...
Страница 644: ......
Страница 647: ...Fig 6E 1 Vacuum Hose Schematic L6 250 CID LD Emissions DISTRIBUTOR PCV VALVE MANIFOLD VAC FITTING...
Страница 648: ...DISTRIBUTOR VALVE Fig 6E 3 Vacuum Hose Schematic L6 292 CID Calif HD Emissions...
Страница 649: ...V A LV E Fig 6E 5 Vacuum Hose Schematic V8 305 CID HD Emissions...
Страница 650: ...Fig 6E 7 Vacuum Hose Schematic V8 350 CID High Altitude Calif LD Emissions...
Страница 651: ...VALVE Fig 6E 9 Vacuum Hose Schematic V8 350 400 CID Except Calif HD Emissions...
Страница 652: ...CANISTER...
Страница 653: ...PCV V AL VE Fig 6E 13 Vacuum Hose Schematic V8 454 CID Except Calif HD Emissions...
Страница 672: ...Fig 6E 29 Air Cleaner 305 350 400 V8 CK...
Страница 682: ......
Страница 691: ...SPECIAL TOOLS n 1 J 25077 1 Vibrator Include Catalyst Container and Fill Tube Extension 2 J 25077 2 Aspirator...
Страница 692: ......
Страница 700: ...Fig 7A 6B Detent Downshift Cable C K and P Series...
Страница 709: ...Fig 7 A 12B CBC 350 Hydraulic Circuit A U TO M A T IC T R A N S M IS S IO N 7 A 1 7...
Страница 743: ...VIEW B FLAT IvEwfDl l6 G tO 2 GAGE...
Страница 744: ......
Страница 755: ...V I E W B WITH AUTOMATIC TRANSMISSION WITH MANUAL TRANSMISSION V I E W A...
Страница 760: ...r...
Страница 766: ......
Страница 767: ...V I E W D 1 6 ENGINE VIEW V 8 ENGINE...
Страница 768: ......
Страница 775: ......
Страница 788: ......
Страница 790: ...STOPLAMP SWITCH See Section 5 Brakes of this manual for adjustment and replacement procedures G MODELS...
Страница 794: ...G A S G A U G E...
Страница 805: ......
Страница 836: ...Fig 8 58 Seat Belt Reminder System Schematic...
Страница 844: ...C H E C K n...
Страница 852: ......
Страница 853: ...SPECIAL TOOLS J 2 3 5 2 0...